JP4286867B2 - INFORMATION RECORDING DEVICE, INFORMATION RECORDING PROGRAM, RECORDING MEDIUM CONTAINING INFORMATION RECORDING PROGRAM, RECORDING MEDIUM, INFORMATION RECORDING METHOD, INFORMATION REPRODUCING DEVICE, INFORMATION REPRODUCING METHOD, INFORMATION REPRODUCING PROGRAM, AND RECORDING MEDIUM CONTAINING INFORMATION REPRODUCING PROGRAM - Google Patents

Description

  The present invention relates to an information recording apparatus for recording a plurality of stream data such as video data and sub data on a recording medium such as an optical disk, and a plurality of stream data from the recording medium recorded by such an information recording apparatus. Are related to an information reproducing apparatus, and a method and a program thereof.

  With the increase in the density and the transfer rate of optical discs, recording of HD (High Definition) video onto optical discs is becoming common. Further, as an added value of the HD video recording function, video data composed of HD video data and main audio data, AV data different from the video data (for example, different audio and video simultaneously broadcast, sub data, and so on) And a recording apparatus having a function of simultaneously recording on the optical disk. A playback apparatus that plays back an optical disc on which such recording has been performed can play back video data and sub-data in synchronization. As an example of a configuration for realizing such a recording / reproducing process, there is an information processing apparatus disclosed in Japanese Published Patent Publication “JP 2002-1557859 A” (published date: May 31, 2002). This prior art will be briefly described with reference to FIGS. 17 (a) to 17 (c).

  First, the structure of stream data used in the prior art will be described. Video data and sub-data are each recorded on an optical disc by the MPEG-2 TS (Transport Stream) method. MPEG-2 TS of video data (hereinafter referred to as video TS) has a structure in which HD video compressed by the MPEG-2 video system and main audio compressed by the AC-3 system are multiplexed. Yes. The sub-data MPEG-2 TS (hereinafter referred to as “audio TS”) has a structure in which sub-audio compressed by the AC-3 system is multiplexed in the same manner as main audio.

  Next, management information regarding the stream will be described. Both the video TS and the audio TS are in a data format in which the reproduction time and the data amount are not proportional. Therefore, a time-address conversion table is recorded on the optical disc in order to enable accurate random access reproduction and special reproduction. In this table, a pair of a time stamp (Presentation Time Stamp) of a decoding startable point and a relative address from the head of TS data is stored.

  In the example shown in FIG. 17A, it is assumed that the head of each of the partial data V1, V2, V3, and V4 of the video TS is a decoding start possible point. When the time stamps indicating the respective decoding start points are T1, T2, T3, and T4 and the relative addresses from the head are P1, P2, P3, and P4, the time-address conversion table is shown in FIG. The table is as shown in b). The same applies to the audio TS, and the time-address conversion table is as shown in FIG.

  When these video TS and audio TS are played back in synchronization, the corresponding data is read out using the time-address conversion tables shown in FIGS. At the time of output, timing adjustment is performed using a time stamp added to the video TS / audio TS.

  However, in the above prior art, in order to reproduce the video TS and the audio TS in synchronization, it is necessary to read both the time-address conversion table for the video TS and the time-address conversion table for the audio TS. There is. That is, there is a problem that the capacity of the memory for temporarily storing the time-address conversion table increases.

  In addition, when an optical TS in which audio TS as sub data is recorded is edited in a device that does not support sub data recording / playback editing, and the video TS is partially deleted, the video TS to be played back synchronously. And inconsistency occurs in the playback section between the audio TS. At this time, a device that supports sub-data recording / playback editing needs to delete the audio TS section corresponding to the deleted section in the video TS. However, the current technology has a problem that complicated processing is required to search for a corresponding section.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to record a plurality of stream data, which are to be reproduced at least partially in synchronization with each other, on a recording medium. Information recording device capable of reducing the amount of memory used during reproduction, information recording program, recording medium recording information recording program, recording medium, information recording method, information reproducing device, information reproducing method, information reproducing program, And providing a recording medium on which an information reproducing program is recorded.

  In order to solve the above problems, an information recording apparatus according to the present invention is a control unit for recording stream data including a plurality of partial data on the recording medium in an information recording apparatus including a recording unit that records information on the recording medium. A table showing combinations of data recording control means for performing reproduction, a reproduction time list indicating the timing at which each partial data is to be reproduced, and specific information for identifying partial data corresponding to each reproduction time of the reproduction time list Table recording control means for controlling recording on the recording medium, and the data recording control means controls the recording of the plurality of stream data to be reproduced at least partially in synchronization with each other on the recording medium. When performing, the table recording control means stores the table corresponding to at least two stream data. That the reproduction time list in a state that mutually matched, and the table corresponding to each stream data and performing control of recording on the recording medium.

  Further, the recording medium according to the present invention includes a stream data composed of a plurality of partial data, a reproduction time list indicating the timing for reproducing each partial data, and a portion corresponding to each reproduction time of the reproduction time list. A recording medium on which a table indicating a combination of specific information for specifying data is recorded, and at least two streams when at least a part of the stream data to be reproduced in synchronization with each other are recorded The table corresponding to each stream data is recorded in a state where the reproduction time lists in the table corresponding to the data are made to coincide with each other.

  The information recording method according to the present invention is an information recording method for recording information on a recording medium, a data recording step for recording stream data composed of a plurality of partial data on the recording medium, and reproducing each partial data. A table recording step for recording on the recording medium a playback time list indicating the timing to be recorded, and a table indicating a combination of specific information for specifying partial data corresponding to each playback time of the playback time list, In the data recording step, when a plurality of the stream data to be reproduced at least partially in synchronization with each other is recorded on the recording medium, in the table recording step, the table in the table corresponding to at least two stream data With each playback time list matching each other, The table corresponding to the stream data is characterized by recording on the recording medium.

  According to the above configuration and method, when the plurality of stream data and the table corresponding to each stream data are recorded on the recording medium, the reproduction time lists in the table corresponding to at least two stream data match each other. Become. When the recording medium on which such recording has been performed is performed, a table corresponding to each stream data is read out to the memory, but by using the fact that the reproduction time lists match, It is possible to reduce the amount of memory used.

  More specifically, for example, if a table corresponding to the first stream data has been read into the memory, only the specific information needs to be read when reading the table corresponding to the second stream data. That is, since it is not necessary to read the playback time list of the table corresponding to the second stream data, it is possible to reduce the amount of memory used during playback.

  For example, when editing processing is performed by a non-compatible device that can only edit one stream data, as described above, the table contents of a plurality of stream data to be reproduced in synchronization with each other are shifted. There was a problem. On the other hand, according to the above configuration, the playback time lists in the table corresponding to at least two stream data match each other. It is possible to easily detect that the editing process by such a non-compatible device has been performed.

  The information reproducing apparatus according to the present invention is an information reproducing apparatus including a reproducing unit that reproduces information recorded on a recording medium, and reads out stream data including a plurality of partial data from the recording medium by the reproducing unit. A table showing a combination of data reproduction control means for controlling, a reproduction time list indicating the timing for reproducing each partial data, and specific information for identifying partial data corresponding to each reproduction time of the reproduction time list Table reproduction control means for performing control to read out the data from the recording medium by the reproduction unit and store it in the memory, and the data reproduction control means includes a plurality of the stream data to be reproduced at least partially in synchronization with each other. The table reproduction control means has a small amount of When reading the table corresponding to each stream data in which the playback time lists in the table corresponding to two stream data match each other, the playback time list corresponding to one stream data is stored in the memory. The reproduction time list corresponding to the remaining stream data is not stored in the memory.

  The information reproducing method according to the present invention is an information reproducing method for reproducing information recorded on a recording medium, wherein a data reproducing step for reading out stream data composed of a plurality of partial data from the recording medium, and the partial data Table step of reading out from the recording medium a table showing a combination of specific information for specifying a reproduction time list indicating the timing at which the data should be reproduced, and partial data corresponding to each reproduction time of the reproduction time list, and storing it in the memory In the data reproduction step, at least a part of the stream data to be reproduced in synchronization with each other is read from the recording medium, and the table reproduction step corresponds to at least two stream data. The playback time in the table When reading the table corresponding to each stream data whose data matches each other, the playback time list corresponding to one stream data is stored in the memory, and the playback time list corresponding to the remaining stream data is stored in the memory. It is characterized by not storing.

  According to the above-described configuration and method, when reproduction is performed on a recording medium on which recording in which reproduction time lists in the table corresponding to at least two stream data match each other is performed, the table corresponding to each stream data Is read out into the memory, but by using the fact that the reproduction time lists match, it is possible to reduce the amount of memory used.

  More specifically, for example, if a table corresponding to the first stream data has been read into the memory, only the specific information needs to be read when reading the table corresponding to the second stream data. That is, since it is not necessary to read the playback time list of the table corresponding to the second stream data, it is possible to reduce the amount of memory used during playback.

It is a block diagram which shows the functional structure of the control part with which the video disc recorder which concerns on one Embodiment of this invention is provided. It is a block diagram which shows schematic structure of the said video disc recorder. It is a block diagram which shows schematic structure of the recording part with which the said video disc recorder is provided. It is a block diagram which shows schematic structure of the reproducing part with which the said video disc recorder is provided. FIG. 4A is a diagram showing an arrangement configuration of data recorded on the optical disc, FIG. 4B is a diagram showing an arrangement configuration of data in the stream area, and FIG. It is a figure which shows the arrangement configuration of the data of an information area. FIG. 4A is a diagram showing an example of the data structure of PlayList, and FIG. 4B is a table showing an example of the PlayList data. It is a figure which shows the data structure of ClipInformation. FIG. 6A is a diagram showing an example of the relative address and reproduction time of each data block in the video TS as video data and the audio TS as sub data, and FIG. It is a table | surface which shows an example of a time-address conversion table, and the same figure (c) is a table | surface which shows an example of the time-address conversion table for audio TS. It is a figure which shows the example of the file directory structure for managing a stream and management information. It is a flowchart which shows the flow of a reproduction | regeneration process. It is a flowchart which shows the flow of PlayItem reproduction | regeneration processing. It is a flowchart which shows the flow of a recording process. It is a flowchart which shows the flow of ClipInformation production processing for video TS. It is a flowchart which shows the flow of ClipInformation production processing for audio TS. It is a flowchart which shows the flow of a matching process. It is a flowchart which shows the flow of inconsistency condition grasping | ascertainment processing. FIG. 6A is a diagram showing an example of the relative address and playback time of each data block in a video TS as video data and an audio TS as sub data, and FIG. It is a table | surface which shows an example of the time-address conversion table for TS, and the same figure (c) is a table | surface which shows an example of the time-address conversion table for conventional audio TS.

  An embodiment of the present invention will be described below with reference to FIGS.

(System configuration)
FIG. 2 shows a basic system configuration of the video disk recorder (information recording apparatus, information reproducing apparatus) 1 according to the present embodiment. As shown in the figure, the video disc recorder 1 includes a host CPU 1010, a RAM 1020, a ROM 1030, a user interface 1040, a bus 1050, a recording unit 1060, a playback unit 1070, a counter 1080, a clock 1090, and a drive 1100. ing.

  The host CPU 1010 is a CPU (Central Processing Unit) that executes an operation control process in the video disk recorder 1. The RAM 1020 is a RAM (Random Access Memory) that functions as a work memory when arithmetic processing by the host CPU 1010 is performed. The ROM 1030 is a ROM (Read Only Memory) that stores various programs and various data used for control processing. That is, when the control process is executed, the program stored in the ROM 1030 is read into the RAM 1020, and the host CPU 1010 executes this program.

  FIG. 1 shows a control process realized by a calculation process by the host CPU 1010 as a functional configuration. Here, the control unit 1500 is assumed as a configuration for executing control processing realized by the host CPU 1010. The control unit 1500 includes a matching processing unit 1510, a reproduction control unit 1520, a ClipInfo creation unit 1530, and a recording control unit 1540.

  The playback control unit 1520 is a block that controls playback processing in the playback unit 1070. The playback control unit 1520 includes a data playback control unit (data playback control unit) 1521 that controls playback processing of stream data, and a table playback control unit (table playback control unit) 1522 that controls playback processing of ClipInformation described later. I have. The matching processing unit 1510 is a block that performs matching processing described later. A recording control unit (data recording control unit) 1540 is a block that controls recording processing in the recording unit 1060. A ClipInfo creation unit (table recording control unit) 1530 is a block that performs a ClipInformation creation process to be described later. Details of processing in each of these functional blocks will be described later. The control unit 1500 may be configured by hardware logic such as ASIC.

  The user interface 1040 is an interface that receives an instruction input from a user. The user interface 1040 is realized by various buttons provided on the surface of the video disc recorder 1, a remote controller, or the like. The user interface 1040 may be realized by a GUI (Graphical User Interface) using a display screen of a display device connected to the video disc recorder 1, and the user interface 1040 is not limited to the display device and may be used by any terminal device. An interface 1040 may be implemented.

  The drive 1100 performs a recording process and a reproducing process on the optical disk (recording medium) 1110.

  The recording unit 1060 encodes an externally input video / main audio signal and sub audio signal, multiplexes them into MPEG-2 TS (hereinafter simply referred to as TS), and sends it to the drive 1100. Further, the playback unit 1070 decodes the TS sent from the drive 1100 and outputs a video / main audio signal and a sub audio signal. Details of the recording unit 1060 and the reproducing unit 1070 will be described later.

  The counter 1080 provides the recording unit 1060 and the reproduction unit 1070 with time information used for adding a time stamp for synchronization to the stream data in the recording unit 1060 and controlling the output timing of the stream data in the reproduction unit 1070. The clock 1090 generates a clock signal used for processing in the recording unit 1060 and the reproduction unit 1070 and generates a clock signal used for counting up the counter 1080.

  In the above configuration, the host CPU 1010, RAM 1020, ROM 1030, user interface 1040, recording unit 1060, playback unit 1070, and drive 1100 are connected to the bus 1050. That is, an instruction input from a user received by the user interface 1040 is transmitted to the host CPU 1010 via the bus 1050, and the recording unit 1060, the playback unit 1070, and the drive 1100 operate according to control based on the calculation of the host CPU 1010. Will do.

(Recording part)
Next, the configuration of the recording unit 1060 will be described with reference to FIG. As shown in the figure, the recording unit 1060 includes a switching unit 1061, a video TS buffer 1062, a video TS encoder 1063, an audio TS buffer 1064, and an audio TS encoder 1065.

  The input video / main audio signal is encoded into a TS by the video TS encoder 1063 and sent to the video TS buffer 1062 as a video TS (stream data). Similarly, the input sub audio signal is encoded into TS by the audio TS encoder 1065 and sent to the audio TS buffer 1064 as audio TS (stream data). Both the video TS buffer 1062 and the audio TS buffer 1064 operate as a FIFO (First In First Out). The switching unit 1061 switches the transmission source of data to be transmitted to the drive 1100 between the video TS buffer 1062 and the audio TS buffer 1064 according to control from the host CPU 1010.

(Playback part)
Next, the configuration of the playback unit 1070 will be described with reference to FIG. As shown in the figure, the playback unit 1070 includes a switching unit 1071, a video TS buffer 1072, a video TS decoder 1073, an audio TS buffer 1074, and an audio TS decoder 1075.

  The switching unit 1071 switches TS transmitted from the optical disk 1110 between the video TS buffer 1072 and the audio TS buffer 1074 according to a command from the host CPU 1010 and transmits the TS. Both the video TS buffer 1072 and the audio TS buffer 1074 operate as a FIFO. The video TS decoder 1073 and the audio TS decoder 1075 decode the video TS and the audio TS, and output a video / main audio signal and a sub audio signal, respectively. At the time of decoding, the video TS decoder 1073 and the audio TS decoder 1075 read the video TS and audio TS from the video TS buffer 1072 and the audio TS buffer 1074 as necessary.

  Note that the decoding / output timing in the video TS decoder 1073 and the audio TS decoder 1075 is determined based on the time stamp given to each access unit (Access Unit) in the read TS. Specifically, the video TS decoder 1073 and the audio TS decoder 1075 constantly monitor the value of the counter 1080, and decode / output the access unit when it matches the time stamp.

  Further, the host CPU 1010 sets the initial value / end value of the counter 1080 at the start of TS reproduction. The video TS decoder 1073 and the audio TS decoder 1075 decode and output only the access units read from the video TS buffer 1072 and the audio TS buffer 1074, respectively, having a time stamp that is greater than the initial value and less than the end value, Skip the rest. However, in the case of the video TS decoder 1073, even an access unit having a time stamp less than the initial value or greater than or equal to the end value, but having a time stamp greater than or equal to the initial value and less than the end value, is necessary for decoding (IP picture). Will decode.

(Data arrangement)
Next, an arrangement configuration of data recorded on the optical disc 1110 will be described. As shown in FIG. 5A, the optical disc 1110 includes a management information area 1111 for recording management information and a stream area 1112 for recording TS.

  As shown in FIG. 5B, the stream area 1112 includes video TS (# 1 to #n) in which video / main audio is encoded and audio TS (# 1 to #k) in which sub audio is encoded. ) Is recorded. One video TS and one audio TS are recorded for each recording.

  In the management information area 1111, as shown in FIG. 5C, PlayList (# 1 to #m) for storing playlist information and ClipInformation (# 1 to # n + k) for storing information related to TS are recorded. Is done. ClipInformation is created corresponding to each audio TS and video TS recorded in the stream area 1112. The corresponding TS and ClipInformation pair is called Clip.

  The video TS is obtained by multiplexing video data compressed by the MPEG-2 video system and main audio data compressed by the AC-3 system into the MPEG-2 TS. On the other hand, the audio TS is obtained by multiplexing the sub audio data compressed by the AC-3 system into the MPEG-2 TS.

(Data structure of management information)
Next, the data structure of PlayList will be described with reference to FIGS. 6 (a) and 6 (b). PlayList is information for managing the playback order of an arbitrary section of an arbitrary Clip, and each section is managed in a unit called “PlayItem”. The start point (IN_time) and end point (OUT_time) of the section are specified by a time stamp (PTS: Presentation Time Stamp) added to the Clip. For example, as shown in FIG. 6A, if a PlayList that reproduces a section from T3 to T4 of Clip-B after a section from T1 to T2 of Clip-A is created, the PlayList data is shown in FIG. It becomes like 6 (b).

  Next, the data structure of ClipInformation will be described with reference to FIG. ClipInformation includes general information (ClipInfo), discontinuous point information (STC_info), program information (ProgramInfo), a time-address conversion table (CPI), and mark information (ClipMark).

  In ClipInfo, attribute information (for example, bit rate) related to the entire corresponding TS is stored. In STC_info, information on time stamp discontinuities in the corresponding TS is stored. ProgramInfo stores attribute information (for example, resolution) related to ES (Elementary Stream) such as video data and audio data included in TS data, and related information between ESs. The CPI will be described later. ClipMark stores bookmark information.

  Next, the time-address conversion table will be described with reference to FIGS. 8 (a) to 8 (c). FIG. 8A shows an example of the relative address and playback time of each data block in the video TS as video data and the audio TS as sub-data. FIG. 8B shows an example of the time-address conversion table for video TS, and FIG. 8C shows an example of the time-address conversion table for audio TS.

  In the example shown in FIG. 8A, the beginning of each of the partial data V1, V2, V3, and V4 of the video TS is a decoding start point. The time stamps indicating the decoding start possible points are T1, T2, T3, and T4, and the relative addresses from the head are P1, P2, P3, and P4. Similarly, the beginning of each of the partial data A1 to A8 of the audio TS is a point where decoding can be started. The time stamps indicating the decoding start possible points are S1 to S8, and the relative addresses from the head are Q1 to Q8.

  8 (a) and 8 (b) are the same as FIGS. 17 (a) and 17 (b) used in the description of the time-address conversion table in the background art, and FIG. 8 (c). Only the difference. That is, the method for setting the value of the time-address conversion table for audio TS in this embodiment is different from the background art.

  Specifically, the time-address conversion table for audio TS is set as follows. First, (1) the number of entries is the same as the number of entries in the video TS time-address conversion table. (2) The time stamp field value (reproduction time) is also the same as the time stamp field value of the video time-address conversion table. Further, (3) the value of the relative address field is the relative address (specific information) of the partial data having the smallest time stamp larger than the value of the time stamp field (playback time list) of the corresponding video TS time-address conversion table. Set to the value of.

  The point (3) will be described using the time stamp T2 in FIG. 8A as an example. T2 is a time stamp of the partial data V2 of the video TS. First, the audio TS is searched for the smallest time stamp that exceeds T2. In the example shown in FIG. 8A, S4 is detected. Next, the relative address corresponding to S4 is searched from the audio TS. Thereby, Q4 is detected. Therefore, the pair of T2 and Q4 is registered in the second entry in FIG.

  By providing the audio TS time-address conversion table with the attributes (1), (2), and (3), it is possible to reduce the amount of memory during reproduction and simplify the handling of inconsistencies, as will be described later.

  Note that the time stamp of the time-address conversion table for audio TS does not match the time stamp assigned to the audio TS. However, the head portion is only missing about several tens of milliseconds corresponding to one audio frame (partial data of the audio TS), and there is no problem in synchronization, and the influence of the loss can be ignored audibly.

  In the above example, the partial data A4 of the audio TS is reproduced from S4 correctly, not from T2. The reason is that A4 is given S4 as a time stamp, and the audio TS decoder 1075 operates to check the time stamp and output A4 when the counter 1080 reaches S4. Therefore, audio output is not performed between T2 and S4.

(File directory structure)
A file / directory structure for managing the above stream and management information will be described with reference to FIG. Each stream and management information are recorded as individual files. The file name of each file consists of a basic part and an extension. The file type can be distinguished by the extension. For example, the extension “m2ts” is attached to the TS file, the extension “clpi” is attached to the ClipInformation file, and the extension “rpls” is attached to the PlayList file.

  Each file is stored in a different directory depending on the type. For example, the PlayList file is / DVR / PLAYLIST directory, the VideoTS ClipInformation is / DVR / CLIPINF directory, the Video TS file is / DVR / M2TS directory, the Audio TS file is / EXT / M2TS directory, and the ClipInformation for audio TS is ClipInformation. , / EXT / CLPI directory.

  Further, the basic part of the file names of the corresponding TS and ClipInformation is common so that the correspondence between TS and ClipInformation can be understood. Also, the audio TS recorded at the same time as the video TS has a basic file name common to the video TS file so that the correspondence can be understood.

(Reproduction processing)
The playback process of the disc video recorder in the present embodiment will be described with reference to the flowchart shown in FIG. Here, it is assumed that a specific playlist reproduction instruction is received from the user through the user interface 1040. Note that the following processing is executed by the table reproduction control unit 1522 of the reproduction control unit 1520 in the control unit 1500 unless otherwise specified.

  First, the contents of the PlayList file corresponding to the playlist specified by the user are read from the optical disk 1110 by the drive 1100 and written to the RAM 1020 (step 2010, hereinafter referred to as S2010). Then, by analyzing the PlayItem included in the read PlayList, the ClipInformation file to be read is specified. Based on the result, the required ClipInformation file for video TS is read from the optical disc 1110 and written to the RAM 1020 (S2020).

  Next, it is searched whether or not the audio TS corresponding to the read ClipInformation file for the video TS is recorded on the optical disc 1110. Specifically, it is searched whether or not a file having the same file name as the read video information file for Video TS is in the EXT_CLPI directory of the optical disc 1110.

  If there is an audio TS corresponding to the read ClipInformation file for the video TS, the ClipInformation file is written in the RAM 1020 (S2030). At this time, with respect to the time-address conversion table, only the relative address field is written on the RAM 1020, and the time stamp field is not written. This is because the time stamp field is the same as the time-address conversion table for the video TS and need not be held. This is made possible by “(2) The time stamp field value is also the same as the time stamp field value of the video time-address conversion table”, which is a feature of the present invention.

  Next, a consistency check between the time-address conversion tables of the video TS and the audio TS is performed by the consistency processing unit 1510 (S2040). The reason why this consistency check is performed is as follows. In general, among devices that perform recording and editing processing on the optical disc 1110, there are devices that do not recognize the audio TS as sub-data (non-compatible devices). When recording or editing processing is performed on the optical disc 1110 by such an incompatible device, it is conceivable that deletion processing, partial deletion processing, or insertion processing of only the video TS is performed. When such a process is performed, there is a possibility that the time stamp in the video TS and the time stamp in the audio TS are shifted. That is, in order to check whether or not such a time stamp shift has occurred, the above-described consistency check is performed.

  A specific process of the consistency check is to compare the number of entries of both in the time-address conversion table of the video TS and the audio TS. Here, it is assumed that the number of entries in the time-address conversion table of the video TS is changed when recording or editing processing is performed by a non-compatible device. Here, since the decoding start point of the video TS is generally about 0.5 seconds to 1 second, it can be said that when the recording or editing process is performed, the number of entries is likely to change.

  In step S2050, the matching processing unit 1510 determines whether matching is performed. If NO in S2050, that is, if it is determined that there is no matching, matching processing is performed by the matching processing unit 1510 (S2100). The matching process will be described later.

  On the other hand, if YES in S2050, that is, if it is determined to be consistent, PlayItem playback processing is performed in the order of PlayItems included in PlayList (S2060 to S2090). First, in S2060, 0 is stored in the variable i. Next, in S2070, it is determined whether i is smaller than the number of PlayItems (num_of_PI). If NO in S2070, i.e., i is greater than or equal to the number of PlayItems, the process ends. If YES in S2070, that is, if i is smaller than the number of PlayItems, the playback unit 1070 performs playback processing of the i-th PlayItem based on an instruction from the data playback control unit 1521 in S2080. Thereafter, in S2090, the variable i is incremented, and the process returns to S2070.

  In order to cause the playback unit 1070 to perform PlayItem playback processing, a PlayItem playback command issued by the data playback control unit 1521 includes a Clip name corresponding to the PlayItem, a playback section start point (IN_time), and an end point (OUT_time). ) Is included. The PlayItem playback process exists in each of the video TS and audio TS, and is an independent task. Here, the PlayItem playback process for the video TS and the PlayItem playback process for the audio TS are executed in a pseudo parallel manner.

  The PlayItem playback process in the playback unit 1070 will be described with reference to FIG. First, in S3000, it is determined whether or not a PlayItem playback command has been issued from the data playback control unit 1521. If NO in S3000, that is, if there is no PlayItem playback command, the process ends.

  On the other hand, if YES in S3000, that is, a PlayItem playback command is detected, the table playback control unit 1522 acquires the name of the clip, IN_time, and OUT_time. Then, the table reproduction control unit 1522 refers to the time-address conversion table of the video TS and audio TS corresponding to the Clip, and searches for the TS reading start address Ps and reading end address Pe. (S3010). At this time, IN_time / OUT_time is transmitted from the data reproduction control unit 1521 to the reproduction unit 1070 as the initial value / end value.

  Next, the initial value of the read start address Px is set to Ps (S3020), and the video TS and the audio TS specified by the Clip name are sequentially buffered until Px reaches Pe (in the case of a video TS, the video TS buffer 1072, the audio TS). In the case of TS, it is read into the audio TS buffer 1074) (S3030 to S3060).

  Specifically, first, in S3030, it is determined whether or not Px is smaller than Pe. If NO in S3030, that is, if Px is equal to or greater than Pe, the playback process associated with the PlayItem playback command is deemed complete, and the process returns to S3000. On the other hand, if YES in S3030, that is, if Px is smaller than Pe, in S3040, processing is first waited until an empty area is created in the buffer, and when an empty area is created in the buffer, data from the address indicated by Px is transferred. Reading is performed, and reproduction processing by the reproduction unit 1070 is performed (S3050). Thereafter, in S3060, the time-address conversion table is referred to, Px is updated to the next value, and the process returns to S3030.

(Recording process)
The recording process of the disc video recorder in the present embodiment will be described with reference to the flowchart shown in FIG. Here, it is assumed that the user has received an instruction to record the video / main audio signal and sub audio signal input to the recording unit 1060 on the optical disc 1110 through the user interface 1040. Note that the following processing is executed by the recording control unit 1540 in the control unit 1500 unless otherwise specified.

  First, a task for creating ClipInformation for each video TS and audio TS to be recorded is started in the ClipInfo creating unit 1530 (S4000 and S4010). In S4000, the creation process of ClipInformation for video TS is started in the ClipInfo creation unit 1530, and in S4010, the creation process of ClipInformation for audio TS is started in the ClipInfo creation unit 1530. Although not shown, the video TS buffer 1062 and the audio TS buffer 1064 are monitored, and a task for recording on the optical disk 1110 is also started in the recording control unit 1540 according to the remaining buffer capacity.

  Thereafter, a recording start command is issued to the recording unit 1060 (S4020), and the process waits until the recording is stopped due to an instruction from the user to stop recording or the capacity of the optical disk 1110 is exceeded (S4030). When a recording stop instruction is detected, a recording stop command is issued to the recording unit 1060 (S4040).

  Thereafter, the completion of creation of ClipInformation by the ClipInfo creation unit 1530 is waited (S4050), and ClipInformation and PlayList are recorded on the optical disc 1110 (S4060).

  Next, Clip Information creation processing for video TS by the ClipInfo creation unit 1530 will be described with reference to the flowchart shown in FIG. First, in S5010, 1 is stored in the variable i. Next, in S5020, it is confirmed whether or not the recording process in the recording unit 1060 has been completed. If YES in S5020, that is, if the recording process ends, in S5060, it is notified that the ClipInformation creation process for video TS has ended, and the process ends.

  On the other hand, if NO in S5020, that is, if the recording process has not ended, first, the time stamp T and the relative address P of the next partial data in the video TS are obtained from the recording unit 1060 (S5030). The time stamp T and the relative address P acquired here are added as Ti and Pi in the i-th entry of the time-address conversion table for video TS (S5040). In step S5050, the variable i is incremented, and the process returns to step S5020.

  Next, the ClipInformation creation processing for audio TS by the ClipInfo creation unit 1530 will be described with reference to the flowchart shown in FIG. First, in S5110, 1 is stored in the variable j. Next, in S5120, it is determined whether or not the recording process in the recording unit 1060 is completed and j is smaller than n which is the number of entries in the video TS time-address conversion table. If YES in S5120, that is, if the recording process is completed and j is equal to or greater than n, it is notified in S5170 that the Clip information creation process for audio TS has been completed, and the process ends.

  On the other hand, if NO in S5120, that is, if the recording process is not completed or j is smaller than n, first, the time stamp S and address Q of the next partial data in the audio TS are obtained from the recording unit 1060. (S5130). In S5140, it is determined whether or not the acquired time stamp S is equal to or greater than Tj, which is the jth time stamp of the video TS time-address conversion table. If NO in S5140, that is, if it is determined that S is smaller than Tj, the process returns to S5120.

  On the other hand, if YES in S5140, that is, if S is equal to or greater than Tj, Tj and Q are registered as the jth entry in the audio TS time-address conversion table (S5150). Thereafter, j is incremented (S5160), and the process returns from S5120. By performing the processing as described above, a time-address conversion table for audio TS as shown in FIG. 8C is created.

(Alignment processing)
Next, the matching process by the matching processing unit 1510 will be described with reference to the flowchart shown in FIG. Here, it is assumed that the number of entries in the time-address conversion table of the video TS is changed when recording or editing processing is performed by a non-compatible device.

  First, in S6100, processing for grasping the inconsistency between the audio TS and the video TS is performed. Next, matching processing between the audio TS and the video TS is performed (S6200). After that, finally, the matching process between the time-address conversion table for audio TS and the time-address conversion table for video TS is performed (S6300).

  Here, the process of grasping the inconsistency between the audio TS and the video TS in S6100 will be described with reference to the flowchart shown in FIG. First, a flag “exist” indicating whether or not video data corresponding to each entry of the time-address conversion table for audio TS exists is initialized (S6110). Next, i and j, which are pointers to the time-address conversion table entry for video TS and audio TS, are each initialized to 1 (S6120).

  Next, the following processing is performed for all entries in the audio TS time-address conversion table. First, in S6130, it is determined whether j is n or less. If NO in S6130, that is, if j is larger than n, the inconsistency status grasping process ends.

  On the other hand, if YES in S6130, that is, if j is n or less, first, the jth entry in the time-address conversion table for audio TS is read from the optical disc 1110 in S6140. The reason why this process is performed is that the time stamp Sj of the jth entry of the audio TS required in the next step is not stored in the RAM 1020 in order to save the use area of the RAM 1020. Such additional reading of data may interrupt playback if it is performed during playback, but it does not pose a problem because real-time performance is not required during the alignment process.

  Next, it is determined whether or not Sj read in S6140 is the same as the i-th time stamp Ti in the time-address conversion table for video TS (S6150). If NO in S6150, that is, if it is determined that Sj and Ti are not the same, j is incremented in S6180 and the processing returns to S6130.

  On the other hand, if YES in S6150, that is, if it is determined that Sj and Ti are the same, the corresponding flag exist [j] is set (S6160). In S6170 and S6180, i and j are incremented, and the process returns to S6130.

  Based on the value of the flag exist, the audio TS matching process in S6200 and the audio TS time-address conversion table matching process in S6300 are performed. Specifically, the audio TS corresponding to the entry for which no flag is set is deleted, and the entry itself is also deleted. In this matching process, the matching processing unit 1510 instructs the recording control unit 1540 to change the time-address conversion table for audio TS, and based on this, the recording control unit 1540 performs the recording changing process on the recording unit 1060. This is realized by giving an instruction to do.

  As described above, “(2) the time stamp field value is also set to be the same as the time stamp field value of the video time-address conversion table”, which is a feature of the present invention, is not possible with the above simple algorithm. It becomes possible to cancel the alignment.

(variation)
In the above-described embodiment, the inconsistency status grasping process (S6100) in the matching process (S2100) is performed after the inconsistency is detected (S2040, S2050). However, the clip information reading process of the audio TS in the reproduction process (S2030) may be performed. Specifically, the inconsistency status grasping process is performed every time one entry of the time-address conversion table is read. This means that the consistency check (S2040) and the incompatibility status grasping (S6100) are simultaneously performed in the clip information read processing (S2030) of the audio TS.

  In this case, since the consistency check is performed every time one entry of the time-address conversion table is read, it is possible to detect the difference between the time stamp in the video TS and the time stamp in the audio TS. It is possible to detect inconsistencies even when the editing in is not accompanied by a change in the number of entries (for example, when the first half and the second half of the video TS are exchanged).

  In this embodiment, it is assumed that the playback time of the video TS and the playback time of the audio TS are substantially the same. However, the playback time of the audio TS is shorter than the playback time of the video TS. It doesn't matter. That is, the audio TS corresponding to the video TS may be partially absent. In this case, the number of entries in the audio TS time-address table is the same as that of the video TS, and data indicating that there is no data is entered in the relative address field of the entry without the audio TS. It is possible to perform the same processing.

  In the present embodiment, it is assumed that the value of the time stamp field of the time-address conversion table of the audio TS always matches that of the corresponding video TS, but it may be recorded without matching. Conceivable. In this case, in order to distinguish from deletion by a non-compatible device, a flag indicating that the recording is made coincident is recorded in ClipInformation for audio TS. As a result, it is possible to avoid performing the matching process on the audio TS recorded without matching.

  In this embodiment, the partial data registered in the time-address conversion table for audio TS has a minimum time stamp that is equal to or greater than the time stamp of the corresponding video TS, but is equal to or less than the time stamp of the corresponding video TS. The maximum time stamp may be used.

  In the present embodiment, “(3) The value of the relative address field is set to the value of the relative address of the partial data having the smallest time stamp larger than the value of the corresponding time stamp field”. Even if 3) is not satisfied, the main effects of the present invention can be achieved. For example, when a relative address value (referred to herein as Tx) of partial data having a time stamp that is greater than the value of the corresponding time stamp field (referred to herein as Tn) but is not the minimum is set from time Tn. When the reproduction is started, the reproduction of the audio TS is not started until the time Tx, but after the time Tx, both are reproduced in synchronization with each other correctly. That is, at the time of reproduction from time Tn, the head audio output is lost by (Tx−Tn).

  When the relative address value of partial data having a time stamp (here called Ty) smaller than the value of the corresponding time stamp field (here called Tm) is set, the host CPU 1010 starts the counter 1080 at the start of reproduction. Is set to Tm, the audio TS decoder 1075 automatically skips the audio TS between Ty and Tm, so that there is no particular problem in reproduction.

  In the present embodiment, the audio TS and the video TS use the same time axis (the same time stamp is given to data to be reproduced at the same time), and different time axes may be used. In this case, a time axis difference between the audio TS and the video TS is obtained, and the time stamp of the audio TS is considered to be obtained by subtracting this difference from what is added in the TS, and a table is created. Good. At this time, if the difference value is recorded in the ClipInformation of the audio TS, an approximate value of the time stamp added in the TS can be obtained.

  In this embodiment, the optical disk 1110 is used as a recording medium. However, the present invention is not limited to this, and any recording medium can be used. For example, a hard disk, a flash memory, or the like may be used as the recording medium.

  In this embodiment, video / main audio and sub audio are used, but other combinations (eg, video and video, video and graphics) may be used.

  In the present embodiment, TS is used as the stream data format, but other formats (eg, PES stream, Program Stream) other than TS may be used.

  In the present embodiment, an example is shown in which two stream data of a video TS and an audio TS are used as stream data recorded on the optical disc 1110. However, three or more types of stream data are recorded on the optical disc 1110. May be. In this case, by matching the values of the time stamp field in at least two or more stream data, it becomes possible to reduce the amount of memory at the time of reproduction and to simplify the mismatch.

  Note that, as described above, each functional block and each processing step provided in the control unit 1500 of the above-described embodiment is performed by a calculation unit such as a CPU executing a program stored in a storage unit such as a ROM or a RAM, and a keyboard or the like. This can be realized by controlling the input means, the output means such as a display, or the communication means such as an interface circuit. Therefore, various functions and various processes of the control unit 1500 of the present embodiment can be realized simply by a computer having these means reading the recording medium on which the program is recorded and executing the program. In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  As this recording medium, a program medium such as a memory (not shown) such as a ROM may be used for processing by the microcomputer, or a program reader is provided as an external storage device (not shown). It may be a program medium that can be read by inserting a recording medium therein.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to a program storage area of the microcomputer and the program is executed. It is assumed that this download program is stored in advance in the main unit.

  The program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a flexible disk or a hard disk, or a disk such as a CD / MO / MD / DVD. Disk system, card system such as IC card (including memory card), or semiconductor memory including flash ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. In particular, there are recording media that carry programs.

  In addition, if the system configuration is capable of connecting to a communication network including the Internet, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network.

  Further, when the program is downloaded from the communication network as described above, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  As described above, the information recording apparatus according to the present invention is a data for performing control to record stream data composed of a plurality of partial data on the recording medium in the information recording apparatus including a recording unit that records information on the recording medium. The recording medium includes a table indicating a combination of recording control means, a reproduction time list indicating the timing at which each partial data should be reproduced, and specific information identifying partial data corresponding to each reproduction time of the reproduction time list. A table recording control means for performing control to record in the recording medium, wherein the data recording control means performs control to record a plurality of the stream data to be reproduced at least partially in synchronization with each other on the recording medium. And the table recording control means reproduces the table in the table corresponding to at least two stream data. Between list in a state that mutually matched, and the table corresponding to each stream data and performing control of recording on the recording medium.

  In the information recording apparatus according to the present invention, in the configuration described above, the table recording control unit adds the remaining stream data to the reproduction time list in the table corresponding to one specific stream data. The reproduction time list in the corresponding table may be set.

  According to the above configuration, the table corresponding to one specific stream data is set to the reproduction time list corresponding to the stream data, while the reproduction time list of the correspondence table is set to the specific stream data for the remaining stream data. It is set according to one stream data. Therefore, with respect to the specific one stream data, it is possible to eliminate the necessity of performing the adjustment process of the reproduction time list, and the process can be simplified.

  In the information recording apparatus according to the present invention, in the above configuration, when the table recording control unit sets the table corresponding to the remaining stream data, each reproduction time in the reproduction time list of the table is set. Specific information for specifying the partial data to be reproduced in the vicinity of as the partial data corresponding to the reproduction time may be set in the table.

  According to the above configuration, in the table corresponding to the stream data whose playback time list is adjusted, the partial data to be played back in the vicinity of each playback time in the playback time list is set as the partial data corresponding to the playback time. It has come to be. Accordingly, when synchronized playback of a plurality of stream data is performed, it is possible to reduce the lack of playback of stream data whose playback time list has been adjusted when the playback times of the playback time list are switched.

  The information recording apparatus according to the present invention further comprises data information recording control means for controlling data information relating to the stream data on the recording medium in the configuration described above, wherein the table recording control means includes a stream. When the data is recorded, when the table is set by performing the process of matching the playback time list, the data information recording control means adds the playback time list to the data information corresponding to the stream data. It is good also as a structure which includes the information which shows that the process which matches is performed.

  According to the above configuration, the data information includes the information indicating that the process for matching the playback time list is being performed. It becomes possible to distinguish those that no longer match.

  In the information recording apparatus according to the present invention, in the above configuration, the table recording control unit sets a table corresponding to stream data having no partial data corresponding to a specific reproduction time in the matched reproduction time list. At this time, information indicating that there is no corresponding partial data may be set as the specific information corresponding to the reproduction time.

  According to the above configuration, even when stream data having different playback times are recorded on the recording medium, the playback time lists in the tables corresponding to the stream data can be matched.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The information recording apparatus and information reproducing apparatus according to the present invention can be applied to a video disk recorder that records / reproduces data on / from an optical disk as described above, and records / reproduces stream data to / from a hard disk or a semiconductor memory, for example. It can be applied to the device. Further, the present invention can be applied to recording / reproducing processing for a recording medium in a terminal device such as a PC.

Claims (13)

In an information recording apparatus comprising a recording unit for recording information on a recording medium,
Data recording control means for controlling the recording of stream data composed of a plurality of partial data on the recording medium;
Control for recording on the recording medium a reproduction time list indicating the timing at which each partial data is to be reproduced, and a table indicating a combination of specific information for identifying partial data corresponding to each reproduction time of the reproduction time list. Table recording control means for performing,
When the data recording control means performs control to record a plurality of the stream data to be reproduced at least partially in synchronization with each other on the recording medium,
The table recording control means performs control to record the table corresponding to each stream data on the recording medium in a state where the reproduction time lists in the table corresponding to at least two stream data are made to coincide with each other. A characteristic information recording apparatus.   The table recording control means sets the reproduction time list in the table corresponding to the remaining stream data so as to match the reproduction time list in the table corresponding to one specific stream data. The information recording apparatus according to claim 1.   When the table recording control means sets the table corresponding to the remaining stream data, the partial data to be reproduced in the vicinity of each reproduction time in the reproduction time list of the table corresponds to the reproduction time. 3. The information recording apparatus according to claim 2, wherein specific information specified as partial data is set in the table. Data information recording control means for performing control to record data information related to the stream data on the recording medium;
When the table recording control means sets the table by performing the process of matching the playback time list when recording certain stream data, the data information recording control means corresponds to the corresponding stream data. The information recording apparatus according to claim 1, wherein the data information includes information indicating that processing for matching the reproduction time list is being performed.   When the table recording control unit sets a table corresponding to stream data that does not have partial data corresponding to a specific reproduction time in the matched reproduction time list, the table recording control unit corresponds as the specific information corresponding to the reproduction time. 2. The information recording apparatus according to claim 1, wherein information indicating that there is no partial data is set.   6. An information recording program for causing a computer to realize each means included in the information recording apparatus according to claim 1.   6. A computer-readable recording medium on which an information recording program for causing a computer to realize each means included in the information recording apparatus according to claim 1 is recorded. Stream data consisting of multiple partial data,
A recording medium on which a reproduction time list indicating the timing at which each partial data is to be reproduced and a table indicating a combination of specific information for identifying partial data corresponding to each reproduction time of the reproduction time list are recorded. And
When a plurality of the stream data to be played back at least partially in synchronization with each other is recorded,
A recording medium, wherein the table corresponding to each stream data is recorded in a state where the reproduction time lists in the table corresponding to at least two stream data are made to coincide with each other. In an information recording method for recording information on a recording medium,
A data recording step of recording stream data composed of a plurality of partial data on the recording medium;
Table recording for recording on the recording medium a reproduction time list indicating the timing at which each partial data should be reproduced, and a table indicating a combination of specific information identifying partial data corresponding to each reproduction time of the reproduction time list And having steps
In the data recording step, when recording a plurality of the stream data to be reproduced at least partially in synchronization with each other on the recording medium,
In the table recording step, the table corresponding to each stream data is recorded on the recording medium in a state where the reproduction time lists in the table corresponding to at least two stream data are made to coincide with each other. Recording method. In an information reproducing apparatus including a reproducing unit for reproducing information recorded on a recording medium,
Data reproduction control means for performing control to read out stream data composed of a plurality of partial data from the recording medium by the reproduction unit;
A reproduction time list indicating the timing for reproducing each partial data, and a table indicating a combination of specific information for identifying partial data corresponding to each reproduction time in the reproduction time list are recorded from the recording medium by the reproduction unit. Table reproduction control means for performing control to read and store in memory,
When the data reproduction control means performs control to read out a plurality of the stream data to be reproduced at least partially in synchronization with each other from the recording medium,
When the table reproduction control means reads the table corresponding to each stream data in which the reproduction time lists in the table corresponding to at least two stream data match each other, the reproduction time corresponding to one stream data An information reproducing apparatus characterized by storing a list in a memory and not storing a reproduction time list corresponding to the remaining stream data in the memory. In an information reproduction method for reproducing information recorded on a recording medium,
A data reproduction step of reading stream data composed of a plurality of partial data from the recording medium;
A reproduction time list indicating the timing at which each of the partial data should be reproduced, and a table indicating a combination of specific information for identifying partial data corresponding to each reproduction time of the reproduction time list are read from the recording medium and stored in the memory. A table step for storing,
In the data reproduction step, when reading a plurality of the stream data to be reproduced at least partially in synchronization with each other from the recording medium,
In the table reproduction step, when reading the table corresponding to each stream data in which the reproduction time lists in the table corresponding to at least two stream data match each other, the reproduction time list corresponding to one stream data Is stored in the memory, and the reproduction time list corresponding to the remaining stream data is not stored in the memory.   The information reproduction program which makes a computer implement | achieve each means with which the information reproduction apparatus of Claim 10 is provided.   A computer-readable recording medium having recorded thereon an information reproducing program for causing a computer to realize each means included in the information reproducing apparatus according to claim 10.

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